httpd mod_jk cluster

[Don Hill <justj2ee@xxxxxxxxx>]

Hi.

I am working on a tomcat 5.5 cluster which is using ajp/1.3 and mod_jk and trying to determine the best cluster design given the hardware. I have 2 xeon 2.3 ghz 2 CPU machines with 38GB ram machine. Currently here is the config I am using. The TOMCAT and HTTPD servers are on the same physical machine.

Each machine is running HTTPD 1.3 with prefork, the MaxClients is 256 due compiled in limits. Each machine has 4 virtualhosts running through one instance of HTTPD. Two of the VHOSTS are the same app running on 2 Tomcat 5.5 with 8GB RAM(configured by customer). The workers are configured to each VHOST meaning for each machine there are 4 workers defined and one worker is defined for each VHOST. I will try and depict this below. The current load balancing is controlled by F5 and manages the load across 2 machines, 4 VHOST for each app.

Based on this info can someone recommend if this configuration could be improved and if so what would you recommend ?

Attached is a pic of the cluster

Thanks for any help on this.

Attachment: apache_httpd_tomcat.pdf
Description: Adobe PDF document

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